Molecular Paneling by Coordination: An M L Hexahedral Molecular Capsule having Clefts for Reversible Guest Inclusion.

Only one positional isomer is obtained from the assembly of 21 small components. A triangular molecular panel with five coordination sites is assembled upon complexation with [Pd (en)] (en=ethylenediamine) into a unique M L hexahedral coordination capsule (see X-ray structure). The capsule can encapsulate/exchange organic guests reversibly through the clefts at the nonbinding sites of the capsule.